P001C
A Camshaft Profile Control Circuit High Bank 1P001C is a generic OBD-II powertrain diagnostic trouble code: A Camshaft Profile Control Circuit High Bank 1. It is logged by the engine control unit when the ckp/cmp monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P001C means
P001C is a generic OBD-II powertrain code indicating that the Powertrain Control Module (PCM) has detected an abnormally high voltage condition in the "A" Camshaft Profile Control Circuit on Bank 1 — the engine bank containing cylinder number one. The "A" designation refers to the intake camshaft. Modern variable valve timing (VVT) and variable valve lift (Valvetronic) systems rely on electronically controlled solenoids or actuator motors to adjust camshaft lobe profiles in real time, optimising power delivery, throttle response, fuel economy, and emissions across the full RPM range. When the PCM commands the Bank 1 camshaft profile actuator and detects that the return signal voltage is higher than the expected operating range, it sets P001C and illuminates the MIL. A high-circuit fault typically points to a short to voltage somewhere in the control circuit, a failed actuator drawing excessive current, or a defective sensor feeding inflated feedback. Oil quality and pressure are also important factors, since hydraulic cam phasers depend on clean oil at adequate pressure to respond correctly to solenoid commands. Ignoring this code can lead to progressive engine performance loss, elevated emissions, and long-term internal engine wear if the camshaft timing remains outside specification.
Common causes
Most-frequently reported root causes when P001C is logged.
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1
Faulty VVT solenoid or Valvetronic motor (camshaft profile actuator) causing excessive voltage feedback
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2
Short to voltage in the camshaft profile control wiring harness or connector
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3
Corroded, loose, or damaged electrical connectors at the actuator or PCM
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4
Defective camshaft position sensor supplying erroneous high-signal data to the PCM
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5
Low engine oil level reducing hydraulic pressure to the cam phaser
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6
Dirty or incorrect-viscosity engine oil restricting oil flow through VVT passages
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7
PCM/ECM internal fault or software error (rare)
Symptoms drivers notice
How to diagnose P001C
A typical diagnostic flow when this code is present.
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1
Connect a professional OBD-II scanner, retrieve stored codes and freeze-frame data to establish conditions at time of fault
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2
Check engine oil level and condition; replace with manufacturer-specified viscosity if dirty or low
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3
Inspect the camshaft profile actuator (VVT solenoid) on Bank 1 for physical damage, oil contamination, or clogging
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4
Visually inspect the wiring harness and connectors between the actuator and PCM for shorts to voltage, chafed insulation, or corrosion
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5
Use a multimeter to measure actuator coil resistance and verify supply voltage and ground at the connector
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6
Test the camshaft position sensor output and compare commanded versus actual cam timing in live scanner data
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7
Clear codes, perform a test drive, and confirm whether the fault returns; check PCM for available software updates if all hardware tests pass
Related powertrain codes
- P000A — A Camshaft Position Slow Response Bank 1
- P000B — B Camshaft Position Slow Response Bank 1
- P000C — A Camshaft Position Slow Response Bank 2
- P000D — B Camshaft Position Slow Response Bank 2
- P0010 — A Camshaft Position Actuator Circuit (Bank 1)
- P0011 — A Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
Frequently asked questions
What does "circuit high" mean in P001C?
"Circuit high" means the PCM detected a voltage in the camshaft profile control circuit that is above the expected operating range. This is most often caused by a short to voltage in the wiring or a faulty actuator, rather than a mechanical camshaft problem.
Can I drive with P001C active?
Short-distance driving is possible, but it is not recommended. Operating with incorrect camshaft timing for extended periods can cause reduced performance, increased emissions, and potential long-term engine wear. Address the fault promptly.
Will a simple oil change fix P001C?
If degraded or low oil is the root cause, an oil change with the correct viscosity can restore proper hydraulic pressure to the cam phaser and clear the code. However, if the fault is electrical — a short to voltage or a failed solenoid — an oil change alone will not resolve it.
Which vehicles are most commonly affected by P001C?
P001C can appear on any OBD-II compliant vehicle with a variable camshaft profile system, including models from Volvo, Chevrolet, Ford, Dodge, Porsche, Land Rover, Audi, Hyundai, and Fiat. It is more frequent in high-mileage engines with irregular oil change histories.
Disabling P001C in software
RaceTune can permanently disable P001C — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
ECU families we can disable P001C on
We hold the DaVinci A2L disable definitions for these families, so the exact P001C path and mask addresses are mapped. verified marks a confirmed disable definition. We support many more — upload your file and our identifier will match it automatically.
- Bosch MG1CP002 verified
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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